Boat-propelling mechanism.



w. 'L. CRAMER.

BOAT PROPELLING MECHANISM.

APPLICATION FILED J'ABLS. 1910 Patented Nov.-29, 1910.

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WILLIAM L. CRAMER, OF BROOKLYN, NEW YORK.

BOAT-PROPELLING MECHANISM.

Application filed January 6, 1910.

T all whom it may concern:

Be it known that I, TILLIAM L. CRAMER, a citizen of the United States,and a resident of Sheepshead Bay, borough of Brooklyn, county of Kings,and State of New York, have invented certain new and useful Improvementsin Boat-Propelling iiechanism, of which the following is a full, clear,and exact description.

This invention relates to a mechanism for propelling boats and theparticular object of said invention is to provide a device of thischaracter which will be simple in construction and at the same time soarranged as to produce an operating mechanism that will give the highestefliciency in speed in proportion to the power supplied.

The primary object of said invention is to construct a propellingmechanism that will do away with the screw propeller and wheelpropellers now in use.

lVith these and other objects in view, the invention will be hereinaftermore particu larly described with reference to the accompanyingdrawings, which form a part of this specification, and will then bepointed out in the claims at the end of the description.

Figure 1 is an elevation partly in section. Fig. 2 is a top plan view;and Fig. 3 is a section on the line I1IIII.

In the drawings, 1 designates the boat structure which is provided withthe usual keel 2. Arranged on either side of said keel is a tubularcasing 3. This tubular casing, which is open at either end, extends theentire length of the boat, said casing being also open at the bottom.Adapted to slide within said casing are the plungers or pistons 1, theend portions of which are provided with a hinged head 5 which is adaptedto feather as the plunger is forced forward. The motor 6, which may beof any suitable character, is adapted to operate a pinion 7 said pinion7 being in engagement with the gears 8 and 9. Connecting rods 10 and 11connect said gear wheels 8 and 9 with a member 12. Said member 12 ismounted on a shaft 13 which passes through the bottom of the boat and isconnected to a pair of crossed levers 141 and 15. The end portions ofthese levers 14 and 15 are provided with connecting rods which connectwith levers adapted to operate the plungers 4. These levers, which aredesignated by the numerals Specification of Letters Patent.

Patented Nov. 29, 1910.

Serial No. 536,661.

16, 17, 1S and 19, are so arranged that when the member 12 is partlyrotated, the levers 1% and 15 which are secured together, are alsopartly rotated. As the connecting rod 10 moves forward, the lever 141will be slightly turned to the right and this will draw the pivotedlever 16 forward by means of the connecting rod 16. The same motion willbe transmitted to the lever 19 by rod 19 which will force said leverbackward. As the lever 15 moves to the right, the lever 17 will beforced forward and the lever 18 backward, and it will therefore be seenthat as the member 12 is operated by the connecting rods 10 and 11, theset of plungers lo cated in the tubular casings on one side of the boat,will move forward as the other set moves backward.

When the piston rods are on their forward stroke, the pivoted blades ofsaid pistons will feather and offer no opposition to the water, but whensaid pistons are on their backward stroke, sufiicient pull will be eX-erted to cause the boat to move forward. It will therefore be seen thata constant reciprocation 0f the two sets of piston members will form aneffective driving mechanism for any type of Water craft.

Each of the levers 16, 17, 18 and 19 are pivotally connected to two ofthe pistons, one connection being at the end portion of a piston on oneside of the boat, and the other at the central portion of the piston onthe opposite side of the boat, the forward piston on one side beingconnected with a rear piston on the other side. This arrangement assuresa steady stroke of the pistons. As the members 14 and 15 move, they inturn by means of the rod connections force the end port-ion of eachlever in one direction or the other, at the same time the other end ofsaid lever, which is connected to the end portion of a piston arrangedon the opposite side of the boat, forces said piston in the op positedirection.

The peculiar arrangement of levers will assure a constant and steadyreciprocation of the plungers and suitable speed-changing gears may beintroduced to regulate the speed at which the gears 8 and 9 travel. Itwill also be noticed that the various levers and connecting links are sopositioned as to take up very little space, and the same can readily bereached for adjusting and repair.

Having thus described my invention, I

vided with channels formed upon either side claim as new and desire tosecure by Letters Patent 1. In a propelling mechanism, a boat, said boathaving cylindrical channels formed upon either side of its keel at apoint below the water line, pistons adapted to reciprocate within saidchannels, a power shaft passing through the central portion of saidboat, a pair of crossed levers mounted upon said shaft, rods pivoted tosaid crossed levers, a lever pivoted to the end portion of each piston,said lever being pivoted at a point n ar its other end to the centralportion of another piston.

2. In a propelling mechanism, a boat proof its keel at a point below thewater line, pistons adapted to reciprocate within said channels, a shaftpassing through the central portion of said boat, crossed levers securedto said shaft, links pivoted to said crossed levers, levers connected atone end to the end portion of a piston and at their other end to one ofthe said links, said levers being connected at a point near their endsto the central portion of a piston.

3. In a propelling mechanism, a boat having cylindrical channels formedupon either side of its keel, pistons adapted to reciprocate in saidchannels, a power shaft extending through the central portion of saidboat, crossed levers adapted to rotate with said shaft, rods pivotallyconnected to said levers, a second set of levers pivotally connected tothe ends of said rods, said levers being adapted to reciprocate saidpistons.

4. In a propelling mechanism, a boat, cylindrical channels formed uponeither side of the keel of said boat at a point below the water line,pistons adapted to reciprocate in said channels, levers connecting thecen tral portion of one piston with the end portion of another piston.

5. In a propelling mechanism, a boat provided with cylindrical channelson either side of its keel and below the water line, a shaft passingthrough the central portion of said boat, a member secured to one end ofsaid shaft, rods connecting said member with a driving mechanism, leverssecured 011 the other end of said shaft, means for connecting saidlevers with a second set of levers, said second set of levers beingadapted to reciprocate said pistons.

This specification signed and witnessed this et-th day of January A. D.1910.

V ILLIAM L. CRAMER. lVitnesses WV. A. Towivnn, Jr., M. DINNI-IAUPT.

